Google Latest (Long) - Benchmarks & Performance - OpenTranscription

Back to Models$0.0107/min

Google Latest (Long)

Name: Google Latest (Long)
Author: Google Cloud

Google Cloud

Batch

Conformer model for long-form audio (minutes to hours)

Transcribe with this model Compare in playground

40 languages · benchmarked

Overall Score

38.7

#18 of 28

Word Error Rate

22.55%

Character Error Rate

13.81%

Match Error Rate

22.18%

Word Info Lost

29.95%

Avg Latency

13.2s

Benchmarks Run

Benchmark trend

last 30 runs

Word error rate

22.55%

↓ 18.0% · 30d

3 runs ago

latest

Avg latency

13.2s

↓ 2.1% · 30d

3 runs ago

latest

Cost vs. accuracy

overall WER · 28 models

Google Latest (Long)

field · 27 models

lower-left is better

Performance by category

8 categories

WER

lower is better

Legal

6.4%

Medical

6.9%

Conversational

10.0%

Technical

10.7%

Finance

11.7%

General

18.0%

Noisy Environment

48.5%

Code-Switching

78.7%

Category	WER	CER	MER	WIL	Latency	Benchmarks
Code-Switching	78.69%	60.26%	76.73%	87.43%	24.8s	2
Conversational	9.99%	5.84%	9.90%	14.51%	14.5s	2
Finance	11.71%	5.68%	11.54%	18.55%	16.8s	2
General	17.99%	10.10%	17.69%	26.10%	12.5s	18
Legal	6.38%	4.12%	6.31%	8.62%	17.1s	2
Medical	6.94%	3.10%	6.89%	10.89%	12.0s	2
Noisy Environment	48.53%	29.55%	47.98%	59.02%	6.3s	4
Technical	10.66%	5.77%	10.51%	16.13%	14.2s	2

Performance by accent

5 accents

Accent	WER	Benchmarks
African	27.69%	1
Australian	38.46%	1
Indian	58.73%	1
British	13.43%	1
American	47.17%	1

Pricing

pay per second

Rate

$0.0107

/min

Per-second billing. Bring your own provider key and pay your provider directly — a 5% routing fee applies (first 100 min/mo free).

Set up BYOK

Cost estimator

1 hour

$0.64

10 hours

$6.41

100 hours

$64.08

1,000 hours

$640.80

Billed per second of audio processed.

API & usage

POST /api/v1/transcriptions

Model ID

google/latest-long

Get an API key

Authenticate every request with your secret API key as a Bearer token. Issue a key from your dashboard.

Quickstart

Upload your audio, create a job with this model, then poll the job or set a webhook_url to be notified when it completes.

# 1. Request a signed upload URL
curl https://opentranscription.io/api/v1/uploads \
  -H "Authorization: Bearer $OT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "file_name": "interview.mp3", "file_size": 3456789, "mime_type": "audio/mpeg" }'
# → { "upload_url": "...", "file_path": "...", "expires_at": "..." }

# 2. Upload the audio bytes to the signed URL
curl -X PUT "$UPLOAD_URL" --upload-file interview.mp3

# 3. Create the transcription job
curl https://opentranscription.io/api/v1/transcriptions \
  -H "Authorization: Bearer $OT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "file_path": "$FILE_PATH",
    "model": "google/latest-long",
    "language": "af",
    "webhook_url": "https://your-app.com/webhooks/ot"
  }'
# → we POST a signed event to your webhook_url when the job finishes — no polling required

Key parameters

file_path

string

required

Storage path returned by the upload step.

model

string

required

The model to run this job on.

language

string

ISO 639-1 language code. Omit to auto-detect.

webhook_url

string

HTTPS URL notified with the result when the job completes. Delivered events are signed (X-OT-Signature).

Response

A completed job returns the transcript in the OpenTranscription Unified Schema (OTUS).

{
  "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "status": "completed",
  "transcript": {
    "text": "Welcome to the meeting, everyone.",
    "language": "en",
    "confidence": 0.97,
    "segments": [
      {
        "id": 0,
        "start": 0,
        "end": 3.5,
        "text": "Welcome to the meeting, everyone."
      }
    ],
    "words": [
      {
        "word": "Welcome",
        "start": 0,
        "end": 0.42,
        "confidence": 0.99
      }
    ]
  }
}

Webhooks — skip polling

We POST a signed event to your webhook_url when a job completes or fails; verify the X-OT-Signature (HMAC-SHA256, reject if older than 300 s) and dedupe on the event id, then fetch the full transcript via GET /api/v1/transcriptions/{id}.

# We POST a signed event to your webhook_url when a job finishes.
# Headers:
#   X-OT-Signature: t=1736937042,v1=5257a869e7eceb6c6c2c2a1b4d6e9f8c2a1b4d6e9f8c2a1b4d6e9f8c2a1b4d6e
#   X-OT-Event-Id: evt_9f8c2a1b4d6e
#   X-OT-Event-Type: transcription.completed
#
# Body (thin event — fetch the transcript with GET /transcriptions/{data.id}):
{
  "id": "evt_9f8c2a1b4d6e",
  "event": "transcription.completed",
  "created": "2025-01-15T10:30:42.000Z",
  "data": {
    "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
    "status": "completed",
    "error_code": null
  }
}
#
# Verify: HMAC-SHA256 over "<t>.<raw_body>" with your signing secret,
# constant-time compare against any v1, and reject if |now - t| > 300s.

Rate-limited per tier — see the X-RateLimit-* response headers.

Full API reference

Similar models

from the same field

More accurate

Amazon Transcribe

Amazon Web Services

4.71% WER

$0.006/min

Compare →

Cheaper

Whisper Large V3 Turbo

Groq

— WER

$0.0007/min

Compare →

Supported Languages

AfrikaansArabicBulgarianCatalanCzechDanishGermanGreekEnglishSpanishEstonianPersianFinnishFrenchHebrewHindiCroatianHungarianIndonesianItalianJapaneseKoreanLithuanianLatvianMalayDutchNorwegianPolishPortugueseRomanianRussianSlovakSlovenianSerbianSwedishThaiTurkishUkrainianVietnameseChinese

Supported Formats

mp3wavflacoggwebm

Features

Word Timestamps

Google Latest (Long)

Benchmark trend

Cost vs. accuracy

Performance by category

Performance by accent

Pricing

API & usage

Similar models

About Google Latest (Long)